Oxygen and nitrogen gases are covers the most part of environmental air and rest of space is occupies with small quantities of water vapour, Carbon Dioxide, Argon, Helium, etc. As their different chemical properties, oxygen and nitrogen have different boiling points so they can be easily separated. Due to much difference in boiling points oxygen and nitrogen gases can be generated in individual form by distillation process through a fractional column. In gas separation process, oxygen is pressurized to a prescribed settled pressure by a liquid pump. In oxygen nitrogen plants nitrogen is however available at a pressure of approximately O.5kg/cm2.